The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/kern/vfs_export.c

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    1 /*-
    2  * Copyright (c) 1989, 1993
    3  *      The Regents of the University of California.  All rights reserved.
    4  * (c) UNIX System Laboratories, Inc.
    5  * All or some portions of this file are derived from material licensed
    6  * to the University of California by American Telephone and Telegraph
    7  * Co. or Unix System Laboratories, Inc. and are reproduced herein with
    8  * the permission of UNIX System Laboratories, Inc.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  * 4. Neither the name of the University nor the names of its contributors
   19  *    may be used to endorse or promote products derived from this software
   20  *    without specific prior written permission.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   32  * SUCH DAMAGE.
   33  *
   34  *      @(#)vfs_subr.c  8.31 (Berkeley) 5/26/95
   35  */
   36 
   37 #include <sys/cdefs.h>
   38 __FBSDID("$FreeBSD: releng/6.2/sys/kern/vfs_export.c 164286 2006-11-14 20:42:41Z cvs2svn $");
   39 
   40 #include <sys/param.h>
   41 #include <sys/dirent.h>
   42 #include <sys/domain.h>
   43 #include <sys/kernel.h>
   44 #include <sys/lock.h>
   45 #include <sys/malloc.h>
   46 #include <sys/mbuf.h>
   47 #include <sys/mount.h>
   48 #include <sys/mutex.h>
   49 #include <sys/socket.h>
   50 #include <sys/systm.h>
   51 #include <sys/vnode.h>
   52 
   53 #include <net/radix.h>
   54 
   55 static MALLOC_DEFINE(M_NETADDR, "Export Host", "Export host address structure");
   56 
   57 static void     vfs_free_addrlist(struct netexport *nep);
   58 static int      vfs_free_netcred(struct radix_node *rn, void *w);
   59 static int      vfs_hang_addrlist(struct mount *mp, struct netexport *nep,
   60                     struct export_args *argp);
   61 static struct netcred *vfs_export_lookup(struct mount *, struct sockaddr *);
   62 
   63 /*
   64  * Network address lookup element
   65  */
   66 struct netcred {
   67         struct  radix_node netc_rnodes[2];
   68         int     netc_exflags;
   69         struct  ucred netc_anon;
   70 };
   71 
   72 /*
   73  * Network export information
   74  */
   75 struct netexport {
   76         struct  netcred ne_defexported;               /* Default export */
   77         struct  radix_node_head *ne_rtable[AF_MAX+1]; /* Individual exports */
   78 };
   79 
   80 /*
   81  * Build hash lists of net addresses and hang them off the mount point.
   82  * Called by ufs_mount() to set up the lists of export addresses.
   83  */
   84 static int
   85 vfs_hang_addrlist(mp, nep, argp)
   86         struct mount *mp;
   87         struct netexport *nep;
   88         struct export_args *argp;
   89 {
   90         register struct netcred *np;
   91         register struct radix_node_head *rnh;
   92         register int i;
   93         struct radix_node *rn;
   94         struct sockaddr *saddr, *smask = 0;
   95         struct domain *dom;
   96         int error;
   97 
   98         /*
   99          * XXX: This routine converts from a `struct xucred'
  100          * (argp->ex_anon) to a `struct ucred' (np->netc_anon).  This
  101          * operation is questionable; for example, what should be done
  102          * with fields like cr_uidinfo and cr_prison?  Currently, this
  103          * routine does not touch them (leaves them as NULL).
  104          */
  105         if (argp->ex_anon.cr_version != XUCRED_VERSION)
  106                 return (EINVAL);
  107 
  108         if (argp->ex_addrlen == 0) {
  109                 if (mp->mnt_flag & MNT_DEFEXPORTED)
  110                         return (EPERM);
  111                 np = &nep->ne_defexported;
  112                 np->netc_exflags = argp->ex_flags;
  113                 bzero(&np->netc_anon, sizeof(np->netc_anon));
  114                 np->netc_anon.cr_uid = argp->ex_anon.cr_uid;
  115                 np->netc_anon.cr_ngroups = argp->ex_anon.cr_ngroups;
  116                 bcopy(argp->ex_anon.cr_groups, np->netc_anon.cr_groups,
  117                     sizeof(np->netc_anon.cr_groups));
  118                 np->netc_anon.cr_ref = 1;
  119                 MNT_ILOCK(mp);
  120                 mp->mnt_flag |= MNT_DEFEXPORTED;
  121                 MNT_IUNLOCK(mp);
  122                 return (0);
  123         }
  124 
  125 #if MSIZE <= 256
  126         if (argp->ex_addrlen > MLEN)
  127                 return (EINVAL);
  128 #endif
  129 
  130         i = sizeof(struct netcred) + argp->ex_addrlen + argp->ex_masklen;
  131         np = (struct netcred *) malloc(i, M_NETADDR, M_WAITOK | M_ZERO);
  132         saddr = (struct sockaddr *) (np + 1);
  133         if ((error = copyin(argp->ex_addr, saddr, argp->ex_addrlen)))
  134                 goto out;
  135         if (saddr->sa_family > AF_MAX) {
  136                 error = EINVAL;
  137                 goto out;
  138         }
  139         if (saddr->sa_len > argp->ex_addrlen)
  140                 saddr->sa_len = argp->ex_addrlen;
  141         if (argp->ex_masklen) {
  142                 smask = (struct sockaddr *)((caddr_t)saddr + argp->ex_addrlen);
  143                 error = copyin(argp->ex_mask, smask, argp->ex_masklen);
  144                 if (error)
  145                         goto out;
  146                 if (smask->sa_len > argp->ex_masklen)
  147                         smask->sa_len = argp->ex_masklen;
  148         }
  149         i = saddr->sa_family;
  150         if ((rnh = nep->ne_rtable[i]) == NULL) {
  151                 /*
  152                  * Seems silly to initialize every AF when most are not used,
  153                  * do so on demand here
  154                  */
  155                 for (dom = domains; dom; dom = dom->dom_next)
  156                         if (dom->dom_family == i && dom->dom_rtattach) {
  157                                 dom->dom_rtattach((void **) &nep->ne_rtable[i],
  158                                     dom->dom_rtoffset);
  159                                 break;
  160                         }
  161                 if ((rnh = nep->ne_rtable[i]) == NULL) {
  162                         error = ENOBUFS;
  163                         goto out;
  164                 }
  165         }
  166         RADIX_NODE_HEAD_LOCK(rnh);
  167         rn = (*rnh->rnh_addaddr)(saddr, smask, rnh, np->netc_rnodes);
  168         RADIX_NODE_HEAD_UNLOCK(rnh);
  169         if (rn == NULL || np != (struct netcred *)rn) { /* already exists */
  170                 error = EPERM;
  171                 goto out;
  172         }
  173         np->netc_exflags = argp->ex_flags;
  174         bzero(&np->netc_anon, sizeof(np->netc_anon));
  175         np->netc_anon.cr_uid = argp->ex_anon.cr_uid;
  176         np->netc_anon.cr_ngroups = argp->ex_anon.cr_ngroups;
  177         bcopy(argp->ex_anon.cr_groups, np->netc_anon.cr_groups,
  178             sizeof(np->netc_anon.cr_groups));
  179         np->netc_anon.cr_ref = 1;
  180         return (0);
  181 out:
  182         free(np, M_NETADDR);
  183         return (error);
  184 }
  185 
  186 /* Helper for vfs_free_addrlist. */
  187 /* ARGSUSED */
  188 static int
  189 vfs_free_netcred(rn, w)
  190         struct radix_node *rn;
  191         void *w;
  192 {
  193         register struct radix_node_head *rnh = (struct radix_node_head *) w;
  194 
  195         (*rnh->rnh_deladdr) (rn->rn_key, rn->rn_mask, rnh);
  196         free(rn, M_NETADDR);
  197         return (0);
  198 }
  199 
  200 /*
  201  * Free the net address hash lists that are hanging off the mount points.
  202  */
  203 static void
  204 vfs_free_addrlist(nep)
  205         struct netexport *nep;
  206 {
  207         register int i;
  208         register struct radix_node_head *rnh;
  209 
  210         for (i = 0; i <= AF_MAX; i++)
  211                 if ((rnh = nep->ne_rtable[i])) {
  212                         RADIX_NODE_HEAD_LOCK(rnh);
  213                         (*rnh->rnh_walktree) (rnh, vfs_free_netcred, rnh);
  214                         RADIX_NODE_HEAD_DESTROY(rnh);
  215                         free(rnh, M_RTABLE);
  216                         nep->ne_rtable[i] = NULL;       /* not SMP safe XXX */
  217                 }
  218 }
  219 
  220 /*
  221  * High level function to manipulate export options on a mount point
  222  * and the passed in netexport.
  223  * Struct export_args *argp is the variable used to twiddle options,
  224  * the structure is described in sys/mount.h
  225  */
  226 int
  227 vfs_export(mp, argp)
  228         struct mount *mp;
  229         struct export_args *argp;
  230 {
  231         struct netexport *nep;
  232         int error;
  233 
  234         nep = mp->mnt_export;
  235         if (argp->ex_flags & MNT_DELEXPORT) {
  236                 if (nep == NULL)
  237                         return (ENOENT);
  238                 if (mp->mnt_flag & MNT_EXPUBLIC) {
  239                         vfs_setpublicfs(NULL, NULL, NULL);
  240                         MNT_ILOCK(mp);
  241                         mp->mnt_flag &= ~MNT_EXPUBLIC;
  242                         MNT_IUNLOCK(mp);
  243                 }
  244                 vfs_free_addrlist(nep);
  245                 mp->mnt_export = NULL;
  246                 free(nep, M_MOUNT);
  247                 nep = NULL;
  248                 MNT_ILOCK(mp);
  249                 mp->mnt_flag &= ~(MNT_EXPORTED | MNT_DEFEXPORTED);
  250                 MNT_IUNLOCK(mp);
  251         }
  252         if (argp->ex_flags & MNT_EXPORTED) {
  253                 if (nep == NULL) {
  254                         nep = malloc(sizeof(struct netexport), M_MOUNT, M_WAITOK | M_ZERO);
  255                         mp->mnt_export = nep;
  256                 }
  257                 if (argp->ex_flags & MNT_EXPUBLIC) {
  258                         if ((error = vfs_setpublicfs(mp, nep, argp)) != 0)
  259                                 return (error);
  260                         MNT_ILOCK(mp);
  261                         mp->mnt_flag |= MNT_EXPUBLIC;
  262                         MNT_IUNLOCK(mp);
  263                 }
  264                 if ((error = vfs_hang_addrlist(mp, nep, argp)))
  265                         return (error);
  266                 MNT_ILOCK(mp);
  267                 mp->mnt_flag |= MNT_EXPORTED;
  268                 MNT_IUNLOCK(mp);
  269         }
  270         return (0);
  271 }
  272 
  273 /*
  274  * Set the publicly exported filesystem (WebNFS). Currently, only
  275  * one public filesystem is possible in the spec (RFC 2054 and 2055)
  276  */
  277 int
  278 vfs_setpublicfs(mp, nep, argp)
  279         struct mount *mp;
  280         struct netexport *nep;
  281         struct export_args *argp;
  282 {
  283         int error;
  284         struct vnode *rvp;
  285         char *cp;
  286 
  287         /*
  288          * mp == NULL -> invalidate the current info, the FS is
  289          * no longer exported. May be called from either vfs_export
  290          * or unmount, so check if it hasn't already been done.
  291          */
  292         if (mp == NULL) {
  293                 if (nfs_pub.np_valid) {
  294                         nfs_pub.np_valid = 0;
  295                         if (nfs_pub.np_index != NULL) {
  296                                 FREE(nfs_pub.np_index, M_TEMP);
  297                                 nfs_pub.np_index = NULL;
  298                         }
  299                 }
  300                 return (0);
  301         }
  302 
  303         /*
  304          * Only one allowed at a time.
  305          */
  306         if (nfs_pub.np_valid != 0 && mp != nfs_pub.np_mount)
  307                 return (EBUSY);
  308 
  309         /*
  310          * Get real filehandle for root of exported FS.
  311          */
  312         bzero(&nfs_pub.np_handle, sizeof(nfs_pub.np_handle));
  313         nfs_pub.np_handle.fh_fsid = mp->mnt_stat.f_fsid;
  314 
  315         if ((error = VFS_ROOT(mp, LK_EXCLUSIVE, &rvp, curthread /* XXX */)))
  316                 return (error);
  317 
  318         if ((error = VFS_VPTOFH(rvp, &nfs_pub.np_handle.fh_fid)))
  319                 return (error);
  320 
  321         vput(rvp);
  322 
  323         /*
  324          * If an indexfile was specified, pull it in.
  325          */
  326         if (argp->ex_indexfile != NULL) {
  327                 MALLOC(nfs_pub.np_index, char *, MAXNAMLEN + 1, M_TEMP,
  328                     M_WAITOK);
  329                 error = copyinstr(argp->ex_indexfile, nfs_pub.np_index,
  330                     MAXNAMLEN, (size_t *)0);
  331                 if (!error) {
  332                         /*
  333                          * Check for illegal filenames.
  334                          */
  335                         for (cp = nfs_pub.np_index; *cp; cp++) {
  336                                 if (*cp == '/') {
  337                                         error = EINVAL;
  338                                         break;
  339                                 }
  340                         }
  341                 }
  342                 if (error) {
  343                         FREE(nfs_pub.np_index, M_TEMP);
  344                         return (error);
  345                 }
  346         }
  347 
  348         nfs_pub.np_mount = mp;
  349         nfs_pub.np_valid = 1;
  350         return (0);
  351 }
  352 
  353 /*
  354  * Used by the filesystems to determine if a given network address
  355  * (passed in 'nam') is present in thier exports list, returns a pointer
  356  * to struct netcred so that the filesystem can examine it for
  357  * access rights (read/write/etc).
  358  */
  359 static struct netcred *
  360 vfs_export_lookup(struct mount *mp, struct sockaddr *nam)
  361 {
  362         struct netexport *nep;
  363         register struct netcred *np;
  364         register struct radix_node_head *rnh;
  365         struct sockaddr *saddr;
  366 
  367         nep = mp->mnt_export;
  368         if (nep == NULL)
  369                 return (NULL);
  370         np = NULL;
  371         if (mp->mnt_flag & MNT_EXPORTED) {
  372                 /*
  373                  * Lookup in the export list first.
  374                  */
  375                 if (nam != NULL) {
  376                         saddr = nam;
  377                         rnh = nep->ne_rtable[saddr->sa_family];
  378                         if (rnh != NULL) {
  379                                 RADIX_NODE_HEAD_LOCK(rnh);
  380                                 np = (struct netcred *)
  381                                     (*rnh->rnh_matchaddr)(saddr, rnh);
  382                                 RADIX_NODE_HEAD_UNLOCK(rnh);
  383                                 if (np && np->netc_rnodes->rn_flags & RNF_ROOT)
  384                                         np = NULL;
  385                         }
  386                 }
  387                 /*
  388                  * If no address match, use the default if it exists.
  389                  */
  390                 if (np == NULL && mp->mnt_flag & MNT_DEFEXPORTED)
  391                         np = &nep->ne_defexported;
  392         }
  393         return (np);
  394 }
  395 
  396 /*
  397  * XXX: This comment comes from the deprecated ufs_check_export()
  398  * XXX: and may not entirely apply, but lacking something better:
  399  * This is the generic part of fhtovp called after the underlying
  400  * filesystem has validated the file handle.
  401  *
  402  * Verify that a host should have access to a filesystem.
  403  */
  404 
  405 int 
  406 vfs_stdcheckexp(mp, nam, extflagsp, credanonp)
  407         struct mount *mp;
  408         struct sockaddr *nam;
  409         int *extflagsp;
  410         struct ucred **credanonp;
  411 {
  412         struct netcred *np;
  413 
  414         np = vfs_export_lookup(mp, nam);
  415         if (np == NULL)
  416                 return (EACCES);
  417         *extflagsp = np->netc_exflags;
  418         *credanonp = &np->netc_anon;
  419         return (0);
  420 }
  421 

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